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source: trunk/EventBenchConsole/src/de/ugoe/cs/eventbench/windows/EventGenerator.java @ 53

Last change on this file since 53 was 52, checked in by sherbold, 13 years ago
refactored translation layer features for Windows MFC into seperate packages de.ugoe.cs.eventbench.windows.*
File size: 25.2 KB

Line
1	package de.ugoe.cs.eventbench.windows;
2
3	import java.io.IOException;
4	import java.security.InvalidParameterException;
5	import java.util.HashMap;
6	import java.util.Iterator;
7	import java.util.LinkedList;
8	import java.util.List;
9	import java.util.ListIterator;
10	import java.util.Map;
11	import java.util.NoSuchElementException;
12
13	import org.jdom.Document;
14	import org.jdom.Element;
15	import org.jdom.JDOMException;
16	import org.jdom.Namespace;
17	import org.jdom.input.SAXBuilder;
18
19	import de.ugoe.cs.eventbench.data.Event;
20	import de.ugoe.cs.eventbench.data.ReplayableEvent;
21	import de.ugoe.cs.eventbench.windows.data.WindowTree;
22	import de.ugoe.cs.eventbench.windows.data.WindowTreeNode;
23	import de.ugoe.cs.eventbench.windows.data.WindowsMessage;
24	import de.ugoe.cs.util.console.Console;
25
26	/**
27	* <p>
28	* Translates sequences of windows messages into events that can be used by the
29	* Logalyzer core libraries for usage analysis.
30	* </p>
31	*
32	* @author Steffen Herbold
33	*
34	*/
35	public class EventGenerator {
36
37	/**
38	* <p>
39	* Helper method that fetches the document node of an XML file.
40	* </p>
41	*
42	* @param filename
43	* name of the XML file
44	* @return the document node
45	*/
46	private static Document getDocument(String filename) {
47	SAXBuilder builder = new SAXBuilder();
48	Document doc = null;
49
50	try {
51	doc = builder.build(filename);
52	rulesNamespace = Namespace.getNamespace("ul:rules");
53	} catch (JDOMException e) {
54	System.err.println("Invalid rules file.");
55	e.printStackTrace();
56	} catch (IOException e) {
57	System.err.println("Invalid rules file.");
58	e.printStackTrace();
59	}
60
61	return doc;
62	}
63
64	/**
65	* <p>
66	* Name and path of the XML files containing the rules.
67	* </p>
68	*/
69	private String rulesFile;
70
71	/**
72	* <p>
73	* Iterator used for the current sequence.
74	* </p>
75	*/
76	private ListIterator<WindowsMessage> sequenceIterator;
77
78	/**
79	* <p>
80	* Token that is currently being generated.
81	* </p>
82	*/
83	private ReplayableEvent<WindowsMessage> currentToken;
84
85	/**
86	* <p>
87	* Reference to the ul:rules namespace.
88	* </p>
89	*/
90	private static Namespace rulesNamespace;
91
92	/**
93	* <p>
94	* The name of the rule that is currently being evaluated.
95	* </p>
96	*/
97	private String currentRuleName;
98
99	/**
100	* <p>
101	* Internal message storage. Used to implement the
102	* <code>{@literal <store>}</code> and <code>{@literal <storeSeq>}</code>
103	* tags.
104	* </p>
105	*/
106	private Map<String, Object> messageStorage;
107
108	/**
109	* <p>
110	* Creates a new EventGenerator. Sets "rules/rules.xml" as default file for
111	* the rules.
112	* </p>
113	*/
114	public EventGenerator() {
115	rulesFile = "rules/rules.xml";
116	}
117
118	/**
119	* <p>
120	* Tries to match the rules to the given sequence to generate an
121	* {@link Event}.
122	* </p>
123	* <p>
124	* The rules are matched the order, in which they are defined in the XML
125	* file. Therefore, the order of the rules in the file defines priorities,
126	* when multiple rules could be matched to the same sequence.
127	* </p>
128	*
129	* @param sequence
130	* sequence of message for which an event will be generated
131	* @return event that matches the messages; null, if no rule can be matched
132	*/
133	@SuppressWarnings("unchecked")
134	public Event<WindowsMessage> generateEvent(List<WindowsMessage> sequence) {
135	Document rulesDoc = getDocument(rulesFile);
136	Element rulesRoot = rulesDoc.getRootElement();
137
138	List<Element> ruleElements = rulesRoot.getChildren("rule",
139	rulesNamespace);
140
141	boolean isMatch = false;
142
143	for (int ruleIndex = 0; ruleIndex < ruleElements.size() && !isMatch; ruleIndex++) {
144	Element currentRule = ruleElements.get(ruleIndex);
145	currentRuleName = currentRule.getAttributeValue("name");
146	currentToken = new ReplayableEvent<WindowsMessage>(currentRuleName);
147	isMatch = true;
148	messageStorage = new HashMap<String, Object>();
149	sequenceIterator = sequence.listIterator();
150	List<Element> ruleChildrenMsg = currentRule.getChildren("msg",
151	rulesNamespace);
152
153	int i = 0;
154	while (isMatch && i < ruleChildrenMsg.size()) {
155	Element messageElement = ruleChildrenMsg.get(i);
156	if ("true".equals(messageElement.getAttributeValue("multiple"))) {
157	Element nextMessageElement = null;
158	if (i + 1 < ruleChildrenMsg.size()) {
159	nextMessageElement = ruleChildrenMsg.get(i + 1);
160	}
161	try {
162	isMatch = matchMultipleMessages(messageElement,
163	nextMessageElement);
164	} catch (InvalidParameterException e) {
165	Console.printerrln(e.getMessage());
166	}
167	} else {
168	try {
169	isMatch = matchSingleMessage(messageElement);
170	} catch (InvalidParameterException e) {
171	Console.printerrln(e.getMessage());
172	}
173	}
174	i++;
175	}
176	if (isMatch) {
177	List<Element> ruleChildren = currentRule.getChildren();
178	for (Element genMsgElement : ruleChildren) {
179	if (genMsgElement.getName().equals("genMsg")) {
180	try {
181	generateReplayMessage(genMsgElement);
182	} catch (InvalidParameterException e) {
183	Console.printerrln(e.getMessage());
184	currentToken.invalidateReplay();
185	}
186	} else if (genMsgElement.getName().equals("genMsgSeq")) {
187	try {
188	generateReplaySequence(genMsgElement);
189	currentToken.invalidateReplay();
190	} catch (InvalidParameterException e) {
191	Console.printerrln(e.getMessage());
192	currentToken.invalidateReplay();
193	}
194	}
195	}
196	Element idinfoElement = currentRule.getChild("idinfo",
197	rulesNamespace);
198	if (idinfoElement != null) {
199	// cannot be empty if document is valid
200	List<Element> valueElements = idinfoElement.getChildren();
201	currentToken.setIdInfo(getTermValue(null,
202	valueElements.get(0)));
203	}
204	Console.traceln(currentRule.getAttributeValue("name")
205	+ currentToken.getIdInfo() + " matched");
206	} else {
207	currentToken = null;
208	}
209	}
210	if (!isMatch) {
211	Console.traceln("no match found for sequence: "
212	+ sequence.toString());
213	}
214	return currentToken;
215	}
216
217	private boolean createSequenceLParam(
218	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
219	int constMsgType, Element termElement)
220	throws NoSuchElementException {
221	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
222	if (termElement.getName().equals("seqValue")) {
223	String obj = termElement.getAttributeValue("seqObj");
224	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
225	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
226	throw new InvalidParameterException(
227	"Failure generating replay sequence for rule "
228	+ currentRuleName
229	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
230	}
231	for (WindowsMessage msg : seqVar) {
232	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
233	generatedMessageSeq, msgsGenerated, constMsgType,
234	seqIterator);
235	String paramValueStr = msg.getParameter(termElement
236	.getAttributeValue("param"));
237	int paramValue = 0;
238	try {
239	paramValue = Integer.parseInt(paramValueStr);
240	currentSeqMsg.setLPARAM(paramValue);
241	} catch (NumberFormatException e) {
242	currentSeqMsg.setLPARAMasWindowDesc(paramValueStr);
243	}
244	}
245	if (seqIterator.hasNext()) {
246	// the first seq-var has a different number of elements than the
247	// current one
248	throw new NoSuchElementException();
249	}
250	msgsGenerated = true;
251	} else { // const value
252	int paramValue = Integer.parseInt(getTermValue(null, termElement));
253	while (seqIterator.hasNext()) {
254	seqIterator.next().setLPARAM(paramValue);
255	}
256	}
257	return msgsGenerated;
258	}
259
260	private boolean createSequenceTarget(
261	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
262	int constMsgType, Element termElement)
263	throws NoSuchElementException {
264	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
265	if (termElement.getName().equals("seqValue")) {
266	String obj = termElement.getAttributeValue("seqObj");
267	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
268	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
269	throw new InvalidParameterException(
270	"Failure generating replay sequence for rule "
271	+ currentRuleName
272	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
273	}
274	for (WindowsMessage msg : seqVar) {
275	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
276	generatedMessageSeq, msgsGenerated, constMsgType,
277	seqIterator);
278	String targetString = msg.getParameter(termElement
279	.getAttributeValue("param"));
280	currentSeqMsg.setXmlWindowDescription(targetString);
281	}
282	msgsGenerated = true;
283	} else { // const value
284	throw new AssertionError("target must be a sequence variable!");
285	/*
286	* If target would not be a variable, the message-elements could not
287	* yet be created and the whole sequence might be broken. If this is
288	* to be changed, createSequenceLParam and createSequenceWParam need
289	* to be addepted, too.
290	*/
291	}
292	return msgsGenerated;
293	}
294
295	private boolean createSequenceWParam(
296	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
297	int constMsgType, Element termElement)
298	throws NoSuchElementException {
299	Iterator<WindowsMessage> seqIterator = generatedMessageSeq.iterator();
300	if (termElement.getName().equals("seqValue")) {
301	String obj = termElement.getAttributeValue("seqObj");
302	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
303	if (msgsGenerated && seqVar.size() != generatedMessageSeq.size()) {
304	throw new InvalidParameterException(
305	"Failure generating replay sequence for rule "
306	+ currentRuleName
307	+ ": One or more of the sequence variables used to generate a sequence have different lenghts.");
308	}
309	for (WindowsMessage msg : seqVar) {
310	WindowsMessage currentSeqMsg = getCurrentSeqMsg(
311	generatedMessageSeq, msgsGenerated, constMsgType,
312	seqIterator);
313	String paramValueStr = msg.getParameter(termElement
314	.getAttributeValue("param"));
315	int paramValue = 0;
316	try {
317	paramValue = Integer.parseInt(paramValueStr);
318	currentSeqMsg.setWPARAM(paramValue);
319	} catch (NumberFormatException e) {
320	currentSeqMsg.setWPARAMasWindowDesc(paramValueStr);
321	}
322	}
323	if (seqIterator.hasNext()) {
324	// the first seq-var has a different number of elements than the
325	// current one
326	throw new NoSuchElementException();
327	}
328	msgsGenerated = true;
329	} else { // const value
330	int paramValue = Integer.parseInt(getTermValue(null, termElement));
331	while (seqIterator.hasNext()) {
332	seqIterator.next().setWPARAM(paramValue);
333	}
334	}
335	return msgsGenerated;
336	}
337
338	@SuppressWarnings("unchecked")
339	private boolean evalEqualRestrictions(WindowsMessage currentMessage,
340	Element messageElement) {
341	boolean isMatch = true;
342	for (Element childElement : (List<Element>) messageElement.getChildren(
343	"equals", rulesNamespace)) {
344	List<Element> termElements = childElement.getChildren();
345	// the size 2 of termElements is guaranteed by the XML schema
346	String value1 = getTermValue(currentMessage, termElements.get(0));
347	String value2 = getTermValue(currentMessage, termElements.get(1));
348	if (value1 == null \|\| value2 == null) {
349	isMatch = false;
350	} else {
351	isMatch = isMatch && value1.equals(value2);
352	}
353	}
354	for (Element childElement : (List<Element>) messageElement.getChildren(
355	"equalsSeq", rulesNamespace)) {
356	List<Element> termElements = childElement.getChildren();
357	List<String> values1 = getTermValueSeq(currentMessage,
358	termElements.get(0));
359	List<String> values2 = getTermValueSeq(currentMessage,
360	termElements.get(0));
361	if (values1 == null \|\| values2 == null) {
362	isMatch = false;
363	} else {
364	isMatch = isMatch && values1.equals(values2);
365	}
366	}
367	return isMatch;
368	}
369
370	@SuppressWarnings("unchecked")
371	private void generateReplayMessage(Element genMsgElement) {
372	List<Element> genMsgChildren = genMsgElement.getChildren();
373	WindowsMessage generatedMessage = null;
374	if (genMsgChildren.size() == 1) { // replay stored message without
375	// change
376	String obj = genMsgChildren.get(0).getAttributeValue("obj");
377	generatedMessage = getStoredMessageVariable(null, obj);
378	} else { // generate message according to the rule
379	for (Element genMsgChild : genMsgChildren) {
380	Element termElement = (Element) genMsgChild.getChildren()
381	.get(0);
382	if (genMsgChild.getName().equals("type")) {
383	try {
384	int msgType = Integer.parseInt(getTermValue(null,
385	termElement));
386	generatedMessage = new WindowsMessage(msgType);
387	} catch (NumberFormatException e) {
388	throw new InvalidParameterException(
389	"Failure generating replay sequence for rule "
390	+ currentRuleName
391	+ ": Defined type is not an integer.");
392	}
393	} else if (genMsgChild.getName().equals("target")) {
394	String targetString = getTermValue(null, termElement);
395	generatedMessage.setXmlWindowDescription(targetString);
396	} else if (genMsgChild.getName().equals("LPARAM")) {
397	String paramValueStr = getTermValue(null, termElement);
398	long paramValue = 0;
399	Element loword = genMsgChild.getChild("LOWORD", rulesNamespace);
400	if( loword!=null ) {
401	paramValue = loHiWord(genMsgChild);
402	generatedMessage.setLPARAM(paramValue);
403	} else {
404	try {
405	paramValue = Integer.parseInt(paramValueStr);
406	generatedMessage.setLPARAM(paramValue);
407	} catch (NumberFormatException e) {
408	generatedMessage.setLPARAMasWindowDesc(paramValueStr);
409	}
410	}
411	} else if (genMsgChild.getName().equals("WPARAM")) {
412	String paramValueStr = getTermValue(null, termElement);
413	long paramValue = 0;
414	Element loword = genMsgChild.getChild("LOWORD", rulesNamespace);
415	if( loword!=null ) {
416	paramValue = loHiWord(genMsgChild);
417	generatedMessage.setWPARAM(paramValue);
418	} else {
419	try {
420	paramValue = Integer.parseInt(paramValueStr);
421	generatedMessage.setWPARAM(paramValue);
422	} catch (NumberFormatException e) {
423	generatedMessage.setWPARAMasWindowDesc(paramValueStr);
424	}
425	}
426	}
427	}
428	}
429	if (generatedMessage != null) {
430	int delay = Integer.parseInt(genMsgElement
431	.getAttributeValue("delay"));
432	generatedMessage.setDelay(delay);
433	} else {
434	currentToken.invalidateReplay();
435	}
436	currentToken.addReplayEvent(generatedMessage);
437	}
438
439	@SuppressWarnings("unchecked")
440	private void generateReplaySequence(Element genMsgElement) {
441	List<Element> genMsgSeqChildren = genMsgElement.getChildren();
442	List<WindowsMessage> generatedMessageSeq = new LinkedList<WindowsMessage>();
443	if (genMsgSeqChildren.size() == 1) {
444	String obj = genMsgSeqChildren.get(0).getAttributeValue("seqObj");
445	generatedMessageSeq = getStoredSeqVariable(obj);
446	} else {
447	boolean msgsGenerated = false;
448	int constMsgType = 0;
449	for (Element genMsgSeqChild : genMsgSeqChildren) {
450	Element termElement = (Element) genMsgSeqChild.getChildren()
451	.get(0);
452	if (genMsgSeqChild.getName().equals("type")) {
453	// note: cannot easily be extracted because of mulitple
454	// return values
455	if (termElement.getName().equals("seqValue")) {
456	String obj = termElement.getAttributeValue("seqObj");
457	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
458	for (WindowsMessage msg : seqVar) {
459	generatedMessageSeq.add(new WindowsMessage(msg
460	.getType()));
461	}
462	msgsGenerated = true;
463	} else { // constValue type
464	constMsgType = Integer.parseInt(getTermValue(null,
465	termElement));
466	}
467	} else if (genMsgSeqChild.getName().equals("target")) {
468	msgsGenerated = createSequenceTarget(generatedMessageSeq,
469	msgsGenerated, constMsgType, termElement);
470	} else if (genMsgSeqChild.getName().equals("LPARAM")) {
471	msgsGenerated = createSequenceLParam(generatedMessageSeq,
472	msgsGenerated, constMsgType, termElement);
473	} else if (genMsgSeqChild.getName().equals("WPARAM")) {
474	msgsGenerated = createSequenceWParam(generatedMessageSeq,
475	msgsGenerated, constMsgType, termElement);
476	}
477	}
478	}
479	currentToken.addReplaySequence(generatedMessageSeq);
480	}
481
482	private WindowsMessage getCurrentSeqMsg(
483	List<WindowsMessage> generatedMessageSeq, boolean msgsGenerated,
484	int constMsgType, Iterator<WindowsMessage> seqIterator) {
485	WindowsMessage currentSeqMsg = null;
486	if (msgsGenerated) {
487	currentSeqMsg = seqIterator.next();
488	} else {
489	currentSeqMsg = new WindowsMessage(constMsgType);
490	generatedMessageSeq.add(currentSeqMsg);
491	}
492	return currentSeqMsg;
493	}
494
495	private WindowsMessage getStoredMessageVariable(
496	WindowsMessage currentMessage, String obj)
497	throws InvalidParameterException {
498	WindowsMessage varMessage = null;
499	if (obj.equals("this")) {
500	if (currentMessage == null) {
501	throw new InvalidParameterException(
502	"Failure obtaining term value for rule "
503	+ currentRuleName
504	+ ": \"this\" is not a valid name for generating runtime messages.");
505	}
506	varMessage = currentMessage;
507	} else {
508	Object tmp = messageStorage.get(obj);
509	if (tmp instanceof WindowsMessage) {
510	varMessage = (WindowsMessage) tmp;
511	} else {
512	throw new InvalidParameterException(
513	"Failure obtaining term value for rule "
514	+ currentRuleName + ": No message \"" + obj
515	+ "\" stored.");
516	}
517	}
518	return varMessage;
519	}
520
521	@SuppressWarnings("unchecked")
522	private List<WindowsMessage> getStoredSeqVariable(String obj)
523	throws InvalidParameterException {
524	List<WindowsMessage> varMsgSeq = null;
525	Object tmp = messageStorage.get(obj);
526	if (tmp instanceof List<?>) {
527	varMsgSeq = (List<WindowsMessage>) tmp;
528	} else {
529	throw new InvalidParameterException(
530	"Failure obtaining term value for rule " + currentRuleName
531	+ ": No sequence \"" + obj + "\" store.");
532	}
533	return varMsgSeq;
534	}
535
536	private String getTermValue(WindowsMessage currentMessage,
537	Element termElement) {
538	String value = null;
539	WindowsMessage varMessage = null;
540	if (termElement.getName().equals("constValue")) {
541	value = termElement.getAttributeValue("value");
542	} else if (termElement.getName().equals("paramValue")) {
543	String objectName = termElement.getAttributeValue("obj");
544	varMessage = getStoredMessageVariable(currentMessage, objectName);
545	if (varMessage != null) {
546	String param = termElement.getAttributeValue("param");
547	value = varMessage.getParameter(param);
548	}
549	} else if (termElement.getName().equals("winInfoValue")) {
550	String objectName = termElement.getAttributeValue("obj");
551	varMessage = getStoredMessageVariable(currentMessage, objectName);
552	if (varMessage != null) {
553	String paramString = termElement.getAttributeValue("winParam");
554	if (paramString.equals("class")) {
555	value = varMessage.getWindowClass();
556	} else if (paramString.equals("resourceId")) {
557	value = "" + varMessage.getWindowResourceId();
558	} else if (paramString.equals("hwnd")) {
559	value = "" + varMessage.getHwnd();
560	} else if (paramString.equals("parentTarget")) {
561	String target = varMessage.getXmlWindowDescription();
562	int index = target.lastIndexOf("<");
563	if( index==0 ) {
564	Console.println("Trying to adress parent of top-level window! Replay probably invalid!");
565	}
566	value = target.substring(0, index);
567	}
568	}
569	} else if (termElement.getName().equals("msgInfoValue")) {
570	String objectName = termElement.getAttributeValue("obj");
571	varMessage = getStoredMessageVariable(currentMessage, objectName);
572	if (varMessage != null) {
573	String paramString = termElement.getAttributeValue("msgParam");
574	if (paramString.equals("type")) {
575	value = "" + varMessage.getType();
576	} else if (paramString.equals("target")) {
577	value = varMessage.getXmlWindowDescription();
578	}
579	}
580	}
581	return value;
582	}
583
584	private List<String> getTermValueSeq(WindowsMessage currentMessage,
585	Element termElement) {
586	List<String> values = new LinkedList<String>();
587	if (termElement.getName().equals("seqValue")) {
588	String obj = termElement.getAttributeValue("seqObj");
589	String param = termElement.getAttributeValue("param");
590	List<WindowsMessage> seqVar = getStoredSeqVariable(obj);
591
592	for (WindowsMessage msg : seqVar) {
593	// msg.getParameter returns null, if parameter is not found,
594	// therefore the List can contain null-values
595	values.add(msg.getParameter(param));
596	}
597	}
598	return values;
599	}
600
601	@SuppressWarnings("unchecked")
602	private void handleStorage(Element messageElement,
603	WindowsMessage currentMessage) {
604	for (Element childElement : (List<Element>) messageElement.getChildren(
605	"store", rulesNamespace)) {
606	String identifier = childElement.getAttributeValue("var");
607	messageStorage.put(identifier, currentMessage);
608	resolveHwnd(currentMessage, childElement);
609	}
610	for (Element childElement : (List<Element>) messageElement.getChildren(
611	"storeSeq", rulesNamespace)) {
612	String identifier = childElement.getAttributeValue("varSeq");
613	Object tmp = messageStorage.get(identifier);
614	List<WindowsMessage> storedSequence;
615	if (tmp == null \|\| tmp instanceof WindowsMessage) {
616	storedSequence = new LinkedList<WindowsMessage>();
617	storedSequence.add(currentMessage);
618	messageStorage.put(identifier, storedSequence);
619	} else if (tmp instanceof List<?>) {
620	storedSequence = (List<WindowsMessage>) tmp;
621	storedSequence.add(currentMessage);
622	messageStorage.put(identifier, storedSequence);
623	}
624	resolveHwnd(currentMessage, childElement);
625	}
626	}
627
628	private boolean matchMultipleMessages(Element messageElement,
629	Element nextMessageElement) {
630	boolean isMatch = false;
631	boolean isCurrentMatch = false;
632	boolean nextMatchFound = false;
633	WindowsMessage currentMessage = null;
634	WindowsMessage nextMessage = null;
635
636	int type = Integer.parseInt(messageElement.getAttributeValue("type"));
637
638	int nextType = -1;
639	if (nextMessageElement != null) {
640	nextType = Integer.parseInt(nextMessageElement
641	.getAttributeValue("type"));
642	}
643
644	while (!nextMatchFound && sequenceIterator.hasNext()) {
645	currentMessage = sequenceIterator.next();
646	if (type == currentMessage.getType()) {
647	isCurrentMatch = evalEqualRestrictions(currentMessage,
648	messageElement);
649	isMatch = isMatch \|\| isCurrentMatch;
650
651	if (isCurrentMatch) {
652	handleStorage(messageElement, currentMessage);
653	currentToken.setTarget(currentMessage
654	.getXmlWindowDescription());
655	currentToken
656	.setTargetShort(currentMessage.getParentNames());
657	}
658	}
659	if (nextMessageElement != null && isMatch) {
660	// peek next message to check if the sequence ends and the next
661	// match is found
662	if (!sequenceIterator.hasNext()) {
663	return false; // sequence is over, but not all messages are
664	// found
665	}
666	nextMessage = sequenceIterator.next();
667	sequenceIterator.previous();
668
669	if (nextType == nextMessage.getType()) {
670	nextMatchFound = evalEqualRestrictions(nextMessage,
671	nextMessageElement);
672	}
673
674	}
675	}
676
677	return isMatch;
678	}
679
680	private boolean matchSingleMessage(Element messageElement) {
681	boolean isMatch = false;
682	WindowsMessage currentMessage = null;
683
684	int type = Integer.parseInt(messageElement.getAttributeValue("type"));
685
686	while (!isMatch && sequenceIterator.hasNext()) {
687	// traverses the messages from the current position forward till a
688	// message with the correct type is found
689	currentMessage = sequenceIterator.next();
690	if (type == currentMessage.getType()) {
691	// message with the correct type found
692	// eval child nodes for further matching/storing
693	isMatch = evalEqualRestrictions(currentMessage, messageElement);
694
695	// in case the message is a match, eval storage children
696	if (isMatch) {
697	handleStorage(messageElement, currentMessage);
698	currentToken.setTarget(currentMessage
699	.getXmlWindowDescription());
700	currentToken
701	.setTargetShort(currentMessage.getParentNames());
702	}
703	}
704	}
705
706	return isMatch;
707	}
708
709	@SuppressWarnings("unchecked")
710	private void resolveHwnd(WindowsMessage currentMessage, Element childElement) {
711	List<Element> resolveElements = childElement.getChildren("resolveHwnd",
712	rulesNamespace);
713	for (Element resolveElement : resolveElements) {
714	String param = resolveElement.getAttributeValue("param");
715	String storeParam = resolveElement.getAttributeValue("storeParam");
716	int paramHwnd = Integer
717	.parseInt(currentMessage.getParameter(param));
718	WindowTreeNode node = WindowTree.getInstance().find(paramHwnd);
719	if (node != null) {
720	currentMessage.addParameter(storeParam,
721	node.xmlRepresentation());
722	}
723	}
724	}
725
726	private long loHiWord(Element param) {
727	Element loword = param.getChild("LOWORD", rulesNamespace);
728	Element hiword = param.getChild("HIWORD", rulesNamespace);
729	String lowordStr = getTermValue(null, (Element) loword.getChildren().get(0));
730	String hiwordStr = getTermValue(null, (Element) hiword.getChildren().get(0));
731	return MAKEPARAM(Short.parseShort(lowordStr), Short.parseShort(hiwordStr));
732	}
733
734	private static int MAKEPARAM(short loword, short hiword) {
735	return loword\| ((int) hiword) << Short.SIZE;
736	}
737
738	}

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